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Finding the Fourth Proportional to 885.20, 1,220.28 and 664.16

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Solution

The fourth proportional to 885.20, 1,220.28 and 664.16 is: 915.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.20 : 1,220.28 = 664.16 : x
  2. Step 2: Convert to fraction form
    885.20/1,220.28 = 664.16/x
  3. Step 3: Cross multiply
    885.20x = 1,220.28 × 664.16
  4. Step 4: Simplify right side
    885.20x = 810,461.16
  5. Step 5: Solve for x
    x = 810,461.16/885.20
  6. Step 6: Final answer
    x = 915.57

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.